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Lucent Technologies Inc.
Advance Product Brief
March 1997
ATM Switch Element (ASX)
LUC4AS01
S
LUCENT TECHNOLOGIES—PROPRIETARY
Use pursuant to Company Instructions
Description
Figure 1 shows the architecture of an ATM switch
designed with the ATLANTA chip set. This document
summarizes ATLANTA switch fabrics and the
LUC4AS01 ATM Switch Element (ASX). The ATLANTA
ASX device provides the switching function for an ATM
switch fabric. This 8 x 8 switch element functions as a
complete 5 Gbits/s switch fabric with OC-12 equivalent
port rates, or as a building block for larger three stage
switch fabrics (up to 40 x 40 OC-12 equivalent ports,
25 Gbits/s systems). The ASX interfaces directly to
both the ATLANTA LUC4AC01 ATM Crossbar Element
(ACE) device (for linking switch elements) and the
LUC4AB01 ATM Buffer Manager (ABM) device (for
buffer management). High-performance, nonblocking,
lossless, and self-routing switch fabrics can be con-
structed using the ATLANTA chip set.
5-4554r9
Figure 1. Architecture of an ATM Switch Using the ATLANTA Chip Set
ALM
LUC4AU01
MICROPROCESSOR
INTERFACE
SRAM
LINE CARD #1
#1
#1
#1
LINE CARD #N
N x N SWITCH FABRIC
#N
#N
B
R
ABM
LUC4AB01
SRAM
PHYSICAL LAYER
INTERFACE (MPHY)
ALM
LUC4AU01
SRAM
ABM
LUC4B01
SRAM
ASX
LUC4AS01
ACE
LUC4AC01
ASX
LUC4AS01
ASX
LUC4AS01
ACE
LUC4AC01
ASX
LUC4AS01
#1
#1
N x N REDUNDANT SWITCH FABRIC
#N
ASX
LUC4AS01
ACE
LUC4AC01
ASX
LUC4AS01
ASX
LUC4AS01
ACE
LUC4AC01
ASX
LUC4AS01
#1
#1
#N
INGRESS DIRECTION
EGRESS DIRECTION
#1
#N
#N
#N
#N
1
M
PHY PORTS
1
M
PHY PORTS
MICROPROCESSOR
INTERFACE
MICROPROCESSOR
INTERFACE
MICROPROCESSOR
INTERFACE